added zigbee2mqtt app

apps/zigbee2mqtt/config.json

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+{
+  "$schema": "../schema.json",
+  "name": "Zigbee2MQTT",
+  "port": 8290,
+  "available": true,
+  "exposable": true,
+  "id": "zigbee2mqtt",
+  "tipi_version": 1,
+  "version": "1.35",
+  "categories": [
+    "utilities", 
+    "automation"
+  ],
+  "description": "Zigbee to MQTT bridge, get rid of your proprietary Zigbee bridges",
+  "short_desc": "Zigbee to MQTT bridge",
+  "author": "@Koenkk",
+  "source": "https://github.com/Koenkk/zigbee2mqtt",
+  "website": "https://www.zigbee2mqtt.io/",
+  "form_fields": [
+    {
+      "type": "string",
+      "label": "zigbee device path",
+      "required": true,
+      "hint": "/dev/ttyUSB0",
+      "env_variable": "Z2M_DEVICE"
+    }
+  ],
+  "supported_architectures": [
+    "arm64",
+    "amd64"
+  ]
+}

apps/zigbee2mqtt/docker-compose.yml

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+version: "3.7"
+
+services:
+
+  zigbee2mqtt:
+    container_name: zigbee2mqtt
+    image: koenkk/zigbee2mqtt:1.35
+    environment:
+      - TZ=${TZ}
+    volumes:
+      - ${APP_DATA_DIR}/data/:/app/data
+    devices:
+      - ${Z2M_DEVICE}:/dev/ttyACM0
+    ports: 
+      - ${APP_PORT}:8080
+    expose:
+      - 8080
+    restart: unless-stopped
+    labels:
+      # Main
+      traefik.enable: true
+      traefik.http.middlewares.zigbee2mqtt-web-redirect.redirectscheme.scheme: https
+      traefik.http.services.zigbee2mqtt.loadbalancer.server.port: 8080
+      # Web
+      traefik.http.routers.zigbee2mqtt-insecure.rule: Host(`${APP_DOMAIN}`)
+      traefik.http.routers.zigbee2mqtt-insecure.entrypoints: web
+      traefik.http.routers.zigbee2mqtt-insecure.service: zigbee2mqtt-web
+      traefik.http.routers.zigbee2mqtt-insecure.middlewares: zigbee2mqtt-web-redirect
+      # Websecure
+      traefik.http.routers.zigbee2mqtt.rule: Host(`${APP_DOMAIN}`)
+      traefik.http.routers.zigbee2mqtt.entrypoints: websecure
+      traefik.http.routers.zigbee2mqtt.service: zigbee2mqtt-web
+      traefik.http.routers.zigbee2mqtt.tls.certresolver: myresolver
+      # Local domain
+      traefik.http.routers.zigbee2mqtt-local-insecure.rule: Host(`zigbee2mqtt.${LOCAL_DOMAIN}`)
+      traefik.http.routers.zigbee2mqtt-local-insecure.entrypoints: web
+      traefik.http.routers.zigbee2mqtt-local-insecure.service: zigbee2mqtt-web
+      traefik.http.routers.zigbee2mqtt-local-insecure.middlewares: zigbee2mqtt-web-redirect
+      # Local domain secure
+      traefik.http.routers.zigbee2mqtt-local.rule: Host(`zigbee2mqtt.${LOCAL_DOMAIN}`)
+      traefik.http.routers.zigbee2mqtt-local.entrypoints: websecure
+      traefik.http.routers.zigbee2mqtt-local.service: zigbee2mqtt-web
+      traefik.http.routers.zigbee2mqtt-local.tls: true

apps/zigbee2mqtt/metadata/description.md

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+# Zigbee2MQTT 🐝🌉🔨 
+
+Allows you to use your Zigbee devices without the vendor's bridge or gateway.
+
+It bridges events and allows you to control your Zigbee devices via MQTT. In this way you can integrate your Zigbee devices with whatever smart home infrastructure you are using. 
+
+|**Compatible**   | **Integrations**  | **Open Source**  |   
+|---|---|---|
+| Zigbee2MQTT supports [various Zigbee adapters](https://www.zigbee2mqtt.io/guide/adapters/) and a big bunch of [devices](https://www.zigbee2mqtt.io/supported-devices/). | Zigbee2MQTT integrates well with most home automation solutions because it uses [MQTT](https://mqtt.org/). | Zigbee2MQTT is licenced under the free [GNU General Public License 3](https://www.gnu.org/licenses/gpl-3.0.de.html). |
+
+## Setup
+
+You need to have a mqtt broker like [eclipse mosquitto](/apps/eclipse-mosquitto) running to use this app.
+
+###  Configuration of the Zigbee adapter
+
+For USB apdaters you can use dmesg command on Linux hosts to find the mounted device. Where possible you should use the `/dev/serial/by-id/` path of the stick, instead of `/dev/tty*`. This is because the `/dev/tty*` path can change - for example ´/dev/ttyACM0` may become `/dev/ttyACM1` and then later back to `/dev/ttyACM0`. The `/dev/serial/by-id/` path won't change.
+
+The **usb device path** must be set in the settings of the app before installing.
+
+## Integrations
+
+Zigbee2MQTT integrates well with (almost) every home automation solution because it uses MQTT. However the following integrations are worth mentioning:
+
+- [Home Assistant](/apps/homeassistant)
+- [Homey](https://homey.app/)
+- [Domoticz](https://www.domoticz.com/)
+- [Gladys Assistant](https://gladysassistant.com/)
+- [IoBroker](https://www.iobroker.net/)